Add backoff logic to elb_application_lb_info (#977) (#995)

[PR #977/280d7a2f backport][stable-2] Add backoff logic to elb_application_lb_info

This is a backport of PR #977 as merged into main (280d7a2).
SUMMARY
From time to time rate limiting failures occur on the usage of this module, this PR adds backoff logic to the module to improve its stability.
fatal: [127.0.0.1 -> 127.0.0.1]: FAILED! => changed=false 
boto3_version: 1.20.34
botocore_version: 1.23.34
error:
code: Throttling
message: Rate exceeded
type: Sender
msg: 'Failed to list load balancers: An error occurred (Throttling) when calling the DescribeLoadBalancers operation (reached max retries: 4): Rate exceeded'
response_metadata:
http_headers:
content-length: '271'
content-type: text/xml
date: Thu, 10 Mar 2022 10:34:23 GMT
x-amzn-requestid: xxxxx
http_status_code: 400
max_attempts_reached: true
request_id: xxxxx
retry_attempts: 4

ISSUE TYPE

Bugfix Pull Request

COMPONENT NAME
elb_application_lb_info
ADDITIONAL INFORMATION

changelogs/fragments/977-add-backoff-logic-elb-info.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - Add backoff retry logic to elb_application_lb_info (https://github.com/ansible-collections/community.aws/pull/977)

plugins/modules/elb_application_lb_info.py

@@ -152,7 +152,13 @@
 
 from ansible_collections.amazon.aws.plugins.module_utils.core import AnsibleAWSModule
 from ansible_collections.amazon.aws.plugins.module_utils.core import is_boto3_error_code
-from ansible_collections.amazon.aws.plugins.module_utils.ec2 import boto3_tag_list_to_ansible_dict
+from ansible_collections.amazon.aws.plugins.module_utils.ec2 import AWSRetry, boto3_tag_list_to_ansible_dict
+
+
+@AWSRetry.jittered_backoff()
+def get_paginator(connection, **kwargs):
+    paginator = connection.get_paginator('describe_load_balancers')
+    return paginator.paginate(**kwargs).build_full_result()
 
 
 def get_elb_listeners(connection, module, elb_arn):
@@ -206,13 +212,12 @@ def list_load_balancers(connection, module):
     names = module.params.get("names")
 
     try:
-        load_balancer_paginator = connection.get_paginator('describe_load_balancers')
         if not load_balancer_arns and not names:
-            load_balancers = load_balancer_paginator.paginate().build_full_result()
+            load_balancers = get_paginator(connection)
         if load_balancer_arns:
-            load_balancers = load_balancer_paginator.paginate(LoadBalancerArns=load_balancer_arns).build_full_result()
+            load_balancers = get_paginator(connection, LoadBalancerArns=load_balancer_arns)
         if names:
-            load_balancers = load_balancer_paginator.paginate(Names=names).build_full_result()
+            load_balancers = get_paginator(connection, Names=names)
     except is_boto3_error_code('LoadBalancerNotFound'):
         module.exit_json(load_balancers=[])
     except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:  # pylint: disable=duplicate-except
@@ -259,7 +264,7 @@ def main():
                          date='2021-12-01', collection_name='community.aws')
 
     try:
-        connection = module.client('elbv2')
+        connection = module.client('elbv2', retry_decorator=AWSRetry.jittered_backoff(retries=10))
     except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
         module.fail_json_aws(e, msg='Failed to connect to AWS')